Rockwell-automation 284A ArmorStart with ArmorPoint Backplane - Gettin User Manual download pdf (Page 13)

Publication 284A-QS001C-EN-P - July 2006

Group Motor Installations for USA and Canada Markets

The ArmorStart Distributed Motor controllers are listed for use with each

other in group installations per NFPA 79, Electrical Standard for Industrial

Machinery. When applied according to the group motor installation

requirements, two or more motors, of any rating or controller type, are

permitted on a single branch circuit. Group Motor Installation has been

successfully used for many years in the USA and Canada.

Wiring and Workmanship Guidelines

In addition to conduit and seal-tite raceway, it is acceptable to utilize cable

that is dual rated Tray Cable, Type TC-ER and Cord, STOOW, for power

and control wiring on ArmorStart installations. In the USA and Canada

installations, the following guidance is outlined by the NEC and NFPA 79.

In industrial establishments where the conditions of maintenance and

supervision ensure that only qualified persons service the installation, and

where the exposed cable is continuously supported and protected against

physical damage using mechanical protection, such as struts, angles, or

channels, Type TC tray cable that complies with the crush and impact

requirements of Type MC (Metal Clad) cable and is identified for such use

with the marking Type TC-ER (Exposed Run)* shall be permitted between

a cable tray and the utilization equipment or device as open wiring. The

cable shall be secured at intervals not exceeding 1.8 m (6 ft) and installed in

a “good workman-like” manner. Equipment grounding for the utilization

equipment shall be provided by an equipment grounding conductor within

the cable.

*Historically cable meeting these crush and impact requirements were

designated and marked “Open Wiring”. Cable so marked is equivalent to the

present Type TC-ER and can be used.

While the ArmorStart is intended for installation in factory floor

environments of industrial establishments, the following must be taken into

consideration when locating the ArmorStart in the application: Cables,

including those for control voltage including 24V DC and communications,

are not to be exposed to an operator or building traffic on a continuous

basis. Location of the ArmorStart to minimize exposure to continual traffic

is recommended. If location to minimize traffic flow is unavoidable, other

barriers to minimize inadvertent exposure to the cabling should be

considered. Routing cables should be done in such a manner to minimize

inadvertent exposure and/or damage.

Additionally, if conduit or other raceways are not used, it is recommended

that strain relief fittings be utilized when installing the cables for the control

and power wiring through the conduit openings.

The working space around the ArmorStart may be minimized as the

ArmorStart does not require examination, adjustment, servicing or

maintenance while energized. In lieu of this service, the ArmorStart is

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